silent service
Noun
Meaning
(military, informal, sometimes capitalized) The submarine service.
(military, informal, sometimes capitalized, possibly dated) The navy.
Source: en.wiktionary.orgExamples
Early trolleybuses without these systems were even quieter and, in the UK at least, were often referred to as the "Silent Service".
How can the silent service stay in tune with the times?
It is sometimes referred to as the "Silent Service", citation as the submarines are generally required to operate undetected.
The Legend of Electric Boat, Serving The Silent Service.
Shipbuilding patterns, then, imply that bigger platforms lie in store for the silent service.